CN102487311A

CN102487311A - Code generating device and code generating method, code checking device and code checking method, and communication device

Info

Publication number: CN102487311A
Application number: CN2011103864967A
Authority: CN
Inventors: 小高健太郎; 西山文浩; 渡部胜己
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2010-12-06
Filing date: 2011-11-29
Publication date: 2012-06-06
Also published as: US20120144275A1; JP2012124615A

Abstract

A code generating device includes a code word generating section which generates a code word with a predetermined code word length by applying a second matrix Gq of a second error detection method with regard to an information word A' which has been input, and a code word conversion section which converts the code word generated by the code word generating section based on an added fixed value (Qa+Pa) which is formed from respective code words Qa and Pa which are obtained by the second matrix Gq and a first matrix Gp of a first error detection method being respectively applied to an information word A which is formed from a specific data string.

Description

Sign indicating number generates Apparatus and method for, code check Apparatus and method for and communication equipment

Technical field

The disclosure relates to a kind of wrong detection of transmission data in communication system, the data logging system etc. or sign indicating number generation equipment and code generating method, code check equipment and code check method, computer program and communication equipment of error detection correction of being applied to.

More specifically; The disclosure relates to a kind of sign indicating number generation equipment and code generating method that generates with the compatible error-detecting code of another error-detecting method with same code word length; Relate to a kind of foundation and guaranteed code check equipment and code check method with the error-detecting code error detection of the compatibility of another error-detecting method, and relate to a kind of employing and guaranteed communication equipment, communication means and computer program with the error-detecting method of the compatibility of another error-detecting method.

Background technology

In communication system, data logging system etc., when via the transmission path data, mistake appears in data.As a result, in many communication systems and data logging system, introduced the technology of wrong detection and error detection correction.

As the error checking method, known CRC (CRC).In CRC, for using generator polynomial, and generate CRC sign indicating number (odd even (parity)) as the information word that detects target (such as, transmission data).The CRC sign indicating number has following characteristic, wherein, must generate identical sign indicating number according to identical information word, even and only have a byte also not generate diverse yard simultaneously in data.The transfer of data initiator, when generating the CRC sign indicating number, the CRC sign indicating number is appended to the transmission data as redundant data and transmit from transmission data string.Then, in the Data Receiving side,, CRC sign indicating number and the redundant code that is affixed to the transmission data are compared, and can verification mistake whether occur when the transmission data that received generate the CRC sign indicating number.

For example; There is following the proposal about the CRC coding circuit; It is chosen in the generator polynomial that can use in the big as far as possible code length scope, and wherein, it is low as far as possible not detect wrong probability in the sign indicating number; And the smallest hamming distance of sign indicating number big as far as possible (for example, referring to the open No.2006-180172 of japanese laid-open patent application) in given code length and odd even length.

At present, about communication system and register system, the application of standard wrong detection or error detection correction in various standards (below abbreviate " error-detecting method " as).

On the other hand, along with the development of technology, the renewal of the content of said standard also is typical.Here,, suppose following situation along with standard revise: wherein, because the improvement of error-detecting method and other target, and changed the error-detecting method that is adopted.In the case, if do not have compatibility between standard before revision and the revised standard, the user who then meets the existing equipment of the preceding standard of revision causes massive losses.This is because if between existing equipment and new equipment, can not communicate by letter, then existing equipment just can not be used when new equipment becomes main flow.

As a result, in communication system, register system etc., upward compatibility is guaranteed in strong request when changing error-detecting method.That is to say; Not only require itself and the new equipment can the mutual understanding wrong detection or error detection correction (below abbreviate " error-detecting method " as) simply; And require existing equipment can understand the error-detecting code that receives from new equipment, require new equipment also can understand the error-detecting code that generates by existing equipment in addition.

Summary of the invention

Be desirable to provide superior wrong detection or sign indicating number generation equipment and code generating method, code check equipment and code check method, computer program and the communication equipment of error detection correction that is applied in communication system, the data logging system etc.

Also expectation provides the sign indicating number generation equipment and the code generating method of the compatible error-detecting code of a kind of generation and another error-detecting method with same code word length; A kind of foundation has been guaranteed code check equipment and the code check method with the error-detecting code error detection of the compatibility of another error-detecting method; And communication equipment, communication means and computer program with the error-detecting method of the compatibility of another error-detecting method have been guaranteed in a kind of employing.

Sign indicating number generation equipment configuration according to disclosure embodiment has: code word generates part, and it generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for the information word A ' that has imported; And code word conversion portion; It generates the code word that part generates based on changing said code word from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

In sign indicating number generation equipment according to disclosure embodiment; The code word conversion portion that said sign indicating number generates equipment can be configured to make: according to the conversion method that code word Qa is converted into code word Pa; Change the code word that generates from the information word A ' that is imported by said code word generation part based on addition fixed value (Qa+Pa); Wherein, Code word Qa obtains through the information word A that forms from the particular data string is used the second matrix Gq, and code word Pa obtains through information word A being used the first matrix Gp.

In the sign indicating number generation equipment according to disclosure embodiment, the code word conversion portion that sign indicating number generates equipment can be configured to make: change through the code word additional phase that is generated from the information word A ' that has imported by said code word generation part is added fixed value (Qa+Pa).

Sign indicating number generation equipment configuration according to another embodiment of the disclosure has: fixed value is preserved part; It preserves fixed value K; When after higher-order displacement n bit, using the second matrix Gq from minimum effective bit in the bit position; Can obtain from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation according to this fixed value K; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of the second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; Fixed value addition part, its fixed value K is added to input information word A ' from the position of minimum effective bit to higher-order displacement n bit; And code word generation part, its information word A ' that has passed through to addition after the fixed value K uses the second matrix Gq, generates the code word with predetermined codeword length.

Code generating method according to the another embodiment of the disclosure comprises: the second matrix Gq through use second error-detecting method for the information word A ' that has imported generates the code word with predetermined codeword length; And based on changing the code word that is generated from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

Code check equipment configuration according to the another embodiment of the disclosure has: code word generates part; The code word and the original information word A ' of sign indicating number generation equipment generation used in its input, and generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for original information word A '; Code word reverse transformation part; It is based on change the code word with original information word A ' input from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation reversely; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; And check part, it relatively carries out verification through generating code word that part generates from original information word A ' by code word with the code word of partly being carried out by the code word reverse transformation after the reverse transformation.

In code check equipment according to the another embodiment of the disclosure; The code word reverse transformation part of code check equipment can be configured to make: according to the conversion method that code word Qa is converted into code word Pa; Change code word based on addition fixed value (Qa+Pa) with original information word A ' input reversely; Wherein, code word Qa obtains through the information word A that forms from the particular data string is used the second matrix Gq, and code word Pa obtains through information word A being used the first matrix Gp.

In the code check equipment according to the another embodiment of the disclosure, the code word reverse transformation of code check equipment part can be configured to make: the code word additional phase with original information word A ' input is added fixed value (Qa+Pa) change reversely.

Code check equipment configuration according to the another embodiment of the disclosure has: fixed value is preserved part; Code word and original information word A ' that its input uses sign indicating number generation equipment to generate; And preserve fixed value K; When after higher-order displacement n bit, using the second matrix Gq from minimum effective bit in the bit position; Can obtain the addition fixed value (Qa+Pa) that forms from corresponding code word Qa and Pa according to this fixed value K, wherein, said code word Qa and Pa are through respectively the first matrix Gp of the second matrix Gq and first error-detecting method being applied to obtain from the information word A of particular data string formation; Fixed value addition part, its with fixed value K be added to original information word A ' from the position of minimum effective bit to higher-order displacement n bit; Code word generates part, and its information word A ' that has passed through addition after the fixed value K uses the second matrix Gq, generates the code word with predetermined codeword length; And check part, it relatively carries out verification through generating code word that part generates by code word with the code word of importing with original information word A '.

Code check method according to another embodiment of the disclosure comprises: code word and original information word A ' that input uses code generating method to generate; The second matrix Gq through use second error-detecting method for original information word A ' generates the code word with predetermined codeword length; Based on change code word reversely with original information word A ' input from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; And, carry out verification through utilizing code word generation part to compare from code word and the code word after the reverse transformation that original information word A ' generates.

Computer program according to the another embodiment of the disclosure is write with computer-reader form; Make computer be used as: code word generates part, and it generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for the information word A ' that has imported; And code word conversion portion; It generates the code word that part generates based on changing by code word from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

Be defined as with computer-reader form according to the computer program of the another embodiment of the disclosure and write so that realize the computer program of predetermined process on computers.In other words,, represent co-operation on computers, and can obtain to generate equipment identical operations effect with sign indicating number according to disclosure embodiment through the computer program according to the another embodiment of the disclosure is installed on computers.

In addition; Computer program according to the another embodiment of the disclosure is write with computer-reader form; Make computer be used as: code word generates part; The code word and the original information word A ' of sign indicating number generation equipment generation used in its input, and generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for original information word A '; Code word reverse transformation part; It is based on change the code word with original information word A ' input from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation reversely; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; And check part, it relatively carries out verification through generating the code word that code word that part generates from original information word A ' and said code word reverse transformation partly carry out after the reverse transformation by code word.

Be defined as with computer-reader form according to the computer program of the another embodiment of the disclosure and write so that realize the computer program of predetermined process on computers.In other words,, represent co-operation on computers through the computer program according to the another embodiment of the disclosure is installed on computers, and can obtain with according to the code check equipment identical operations effect of the another embodiment of the disclosure.

In addition, the communication equipment according to the another embodiment of the disclosure is equipped with: first sends and the Return Reception Dept. branch, the verification that it generates odd even and carry out odd even from the transmission data according to first error-detecting method; Second sends and the Return Reception Dept. branch, and the verification that it generates odd even and carry out odd even from the transmission data according to second error-detecting method in this second error-detecting method, only generates the odd even identical with first error-detecting method for the specific transmission data; And the Control on Communication part, it sends according to communication sequence control first and Return Reception Dept. divides and second transmission and the Return Reception Dept. branch.

In the communication equipment according to the another embodiment of the disclosure, first of communication equipment sends and the Return Reception Dept. branch is equipped with: first odd even generates part, and it generates the odd even with predetermined codeword length through using the first matrix Gp for the transmission data; And the first parity check part, it generates odd even through use the first matrix Gp for the data that received, and through odd even that is generated and the parity ratio that is connected to the data that received are come error detection.In addition; Second transmission and Return Reception Dept. branch are equipped with: second odd even generates part; Its through use for the transmission data the second matrix Gq generate have the odd even of predetermined codeword length after; Use is changed the odd even that is generated from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation, and wherein, said code word Qa and Pa obtain through respectively this second matrix Gq and this first matrix Gp being applied to the specific transmission data; And the second parity check part; It generates odd even through use the second matrix Gq for the data that received; Use said addition fixed value (Qa+Pa) to change the odd even that is connected to the data that received reversely, and through the parity ratio after odd even that is generated and the reverse transformation is come error detection.

In the communication equipment according to the another embodiment of the disclosure, second odd even of communication equipment generates part and can be configured to make: the addition fixed value (Qa+Pa) according to being affixed to through use the odd even that the second matrix Gq generates for the transmission data is changed; And this second parity check part can be configured to make: change according to the addition fixed value (Qa+Pa) that is affixed to the odd even that is connected to the data that received reversely.

In communication equipment according to the another embodiment of the disclosure; The specific transmission data can comprise the method information which uses in first error-detecting method and second error-detecting method that is illustrated in the following communication process; And the Control on Communication of communication equipment part can be configured to make: be based on through second transmission and Return Reception Dept. and divide the method information that comprises in the specific transmission data that receive, the traffic operation that control first is sent and Return Reception Dept. branch and second sends and Return Reception Dept. divides.

In communication equipment according to the another embodiment of the disclosure; Communication equipment can the application communication sequence; Wherein, sending association request frame, connection request destination via the connection request initiator utilizes connection request to accept that frame is replied and the connection request initiator sends and confirms that response frame connects.Then, the specific transmission data are equivalent to the physical layer header of association request frame, and can in physical layer header, comprise the method information which uses in first error-detecting method and second error-detecting method in the communication process that is illustrated in the back.

In communication equipment according to the another embodiment of the disclosure; The Control on Communication of communication equipment part can be configured to make: first send divide with Return Reception Dept. and second send with the Return Reception Dept. branch from second send with Return Reception Dept. divide sent association request frame after wait reception connection request accept frame, said association request frame comprises the method information that use second error-detecting method is shown in physical layer header; Send and the Return Reception Dept. branch can receive connection request when accepting frame first; Send the affirmation response frame through confirming in the physical layer header of this frame, to include the method information of using first error-detecting method to be shown and to send to divide, and use first error-detecting method to connect with Return Reception Dept. from first; And send and the Return Reception Dept. branch can receive connection request when accepting frame second; Send the affirmation response frame through confirming in the physical layer header of this frame, to include the method information of using second error-detecting method to be shown and to send to divide, and use second error-detecting method to connect with Return Reception Dept. from second.

In the communication equipment according to the another embodiment of the disclosure, the Control on Communication of communication equipment part can be configured to make: first transmission and Return Reception Dept. branch and second transmission and Return Reception Dept. branch are waited for the reception association request frame; Send and Return Reception Dept. branch can receive association request frame the time second; Through confirming in the physical layer header of this frame, to include the method information of using second error-detecting method of illustrating, send and Return Reception Dept. divides and sends connection request and accept frame and use second to send and Return Reception Dept. divides to carry out and confirms response from second, and use second error-detecting method to connect; Send and Return Reception Dept. branch can receive association request frame the time first; Through confirming in the physical layer header of this frame, to include the method information of using first error-detecting method of illustrating, send and Return Reception Dept. divides and sends connection request and accept frame and use first to send and Return Reception Dept. divides to carry out and confirms response from first, and use first error-detecting method to connect.

According to disclosure embodiment, the sign indicating number generation equipment and the code generating method of the compatible error-detecting code of a kind of generation and another error-detecting method with same code word length can be provided; A kind of foundation has been guaranteed code check equipment and the code check method with the error-detecting code error detection of the compatibility of another error-detecting method; And communication equipment, communication means and computer program with the error-detecting method of the compatibility of another error-detecting method have been guaranteed in a kind of employing.

According to disclosure embodiment, can generate code word from the information word A that forms by the particular data string, wherein, can use first error-detecting method that utilizes the first matrix Gp or utilize second error-detecting method of the second matrix Gq to carry out wrong detection.

In communication system, under the situation of use according to the code generating method of disclosure embodiment, when sending particular data, can use first error-detecting method or second error-detecting method to carry out the decoding of transmission data, that is, and wrong detection.Correspondingly; (for example sending particular data in order to be enabled in the sequence that connects between the communication equipment; The physical layer header of the association request frame of describing after a while) time; Carry out based on the processing of which kind of error-detecting method through next confirming to utilize, can between the communication standards of using different error-detecting methods, guarantee compatibility.

Other purpose of the present disclosure, feature and advantage will be from based on becoming obvious the more specifically description of the disclosure embodiment that describes below and the accompanying drawing.

Description of drawings

Figure 1A describes the code word will use the generation of second error-detecting method to convert the figure that has guaranteed with the method for the error-detecting code of the upward compatibility of first error-detecting method into;

Figure 1B describes the code word will use the generation of second error-detecting method to convert the figure that has guaranteed with the method for the error-detecting code of the upward compatibility of first error-detecting method into;

Fig. 2 describes the code word will use the generation of second error-detecting method to convert the figure that has guaranteed with another method of the error-detecting code of the upward compatibility of first error-detecting method into;

Fig. 3 is the figure that is shown in an example of the frame format of using in the communication system;

Fig. 4 schematically illustrates to adopt second error-detecting method and guaranteed the figure with the ios dhcp sample configuration IOS DHCP of the communication equipment of the upward compatibility of first error-detecting method;

Fig. 5 is the figure that is schematically illustrated in the functional configuration of yard generation equipment of generation error error detecting code in first transmission and the Return Reception Dept. branch;

Fig. 6 is schematically illustrated in the figure that sign indicating number that first transmission and Return Reception Dept. divide lieutenant colonel's error checking erroneous detection sign indicating number generates the functional configuration of equipment;

Fig. 7 is schematically illustrated in second to send the figure that generates in dividing with Return Reception Dept. with the functional configuration of the sign indicating number generation equipment of the compatible error-detecting code of first error-detecting method;

Fig. 8 is schematically illustrated in the figure that sign indicating number that second transmission and Return Reception Dept. divide lieutenant colonel's error checking erroneous detection sign indicating number generates the functional configuration of equipment;

Fig. 9 is the figure that schematically illustrates the ios dhcp sample configuration IOS DHCP of the communication equipment that adopts first error-detecting method (being equivalent to existing model);

Figure 10 is the flow chart that is shown in the processing sequence of carrying out when the communication equipment (with reference to figure 4) that adopts second error-detecting method connects with respect to the external communications equipment request;

Figure 11 is the flow chart that is shown in the processing sequence that the communication equipment (with reference to figure 4) that adopts second error-detecting method carries out when external communications equipment receives association request frame;

Figure 12 illustrates wherein the figure that has the communication sequence example that compatible header check sequence connects with first error-detecting method through being provided with, and in said first error-detecting method, uses employed each management frames when setting up said connection;

Figure 13 illustrates wherein the figure that has the communication sequence example that compatible header check sequence connects with first error-detecting method through being provided with, and in said first error-detecting method, uses employed each management frames when setting up said connection;

Figure 14 illustrates wherein the figure that has the communication sequence example that compatible header check sequence connects with first error-detecting method through being provided with, and in said first error-detecting method, uses employed each management frames when setting up said connection;

Figure 15 is the figure that illustrates wherein after the sequence that execution is used for connecting is only used first error-detecting method and connected the communication sequence example of asking to survey from the connection request initiator;

Figure 16 is the figure that illustrates the communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit;

Figure 17 is the figure that illustrates the communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit;

Figure 18 is the figure that illustrates the communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit; And

Figure 19 illustrates wherein by being that the connection request initiator's of receiver communication equipment sends the figure of the phenomenon of C-Req frame as the connection request initiator's of between the CRC of transmitter and ECS, alternately switching according to preset frequency communication equipment and as behaviour off and on.

Embodiment

Below, will describe embodiment of the present disclosure in detail with reference to accompanying drawing.

Below, using preassigned to carry out supposing communication environment in standardized communication system, the register system etc.: wherein to coexist as error-detecting method such as two kinds of first error-detecting method and second error-detecting method dissimilar methods.For example standard revise is depended in the coexistence of this this mode distinct methods, and need guarantee to follow the upward compatibility of first error-detecting method of existing standard for second error-detecting method of following new standard.Below, first error-detecting method is called as " ECS (error checking sequence) " (working title).In addition, can adopt CRC-16, below it abbreviated as " CRC " as second error-detecting method.Here, all following calculating all are Mod2.

At first, will method that use second error-detecting method to generate the error-detecting code of the upward compatibility of having guaranteed first error-detecting method be described with reference to Figure 1A and 1B.

Transmission data string is set to A.In first error-detecting method; Through using afterbody that the odd even generator matrix Gp that forms from predetermined generator polynomial generates code word (odd even) Pa as equality (1) shown in and odd even Pa is connected to data A from data A, be provided with and transmit data (with reference to Figure 1A) as the redundant code that is used for wrong detection.

Gp×A ^T＝Pa ^T ...(1)

On the other hand, in second error-detecting method, generate code word through using the odd even generator matrix Gq that forms from the generator polynomial different with the generator polynomial of first error-detecting method.When data A is used odd even generator matrix Gq, shown in equality (2), generate the odd even Qa different with odd even Pa.Yet in addition, odd even generator matrix Gp must generate identical code word from identical information word with Gq.In addition, any generation among use odd even generator matrix Gp and the Gq has the code word of same code word length.

Gq×A ^T＝Qa ^T ...(2)

In second error-detecting method, when odd even Qa is used as redundant code,, also be different from Pa even code word size is identical with the code word size of Pa.As a result, when receiving that wherein odd even Qa is connected to the transmission data of data A, the communication equipment that meets first error-detecting method can not generate odd even Qa from data A, and can not error detection handle.That is to say there is not upward compatibility.

On the other hand; Odd even Qa is added to original odd even Qa (promptly with the value (Qa+Pa) of using odd even generator matrix Gp from the odd even Pa addition of identical data A generation; Adopt XOR), can convert the redundant data Qa ' identical (=Pa) (with reference to Figure 1B) into first error-detecting method.

Correspondingly; When meeting the communication equipment transmission data A of second error-detecting method; Use odd even generator matrix Gp to generate odd even Qa from data A; And with the mode identical with aforesaid way use as the processing described among Figure 1A and the 1B with odd even Qa convert into redundant data Qa ' (=Pa); If redundant data Qa ' is connected to transmission data A as odd even and be sent out, even then also can utilize redundant data Qa ' to carry out wrong detection or error detection correction same as before in the communication equipment side that meets first error-detecting method.In addition; When the communication equipment that meets second error-detecting method receives when wherein redundant code Pa being connected to the transmission data of data A from the communication equipment that meets first error-detecting method; Since through being added to appended redundant code Pa (getting XOR), (Qa+Pa) can convert original redundant code Qa into reversely, therefore can error detection through the data A that is received is used odd even generator matrix Gq.

Here; If the communication equipment that meets second error-detecting method is carried out the multiplication of odd even generator matrix Gp and Gq for any transmission data A; Also can generate the redundant code Pa that possibly carry out error-detecting even then meet the communication equipment of first error-detecting method, and can normally guarantee upward compatibility.Yet the multiplication of when transmit frame, just carrying out the odd even generator matrix makes that calculating is tediously long for twice, and has also unnecessarily increased the burden of computing in addition.

The inventor considers: when sending, will meet the redundant data of guaranteeing upward compatibility that the communication equipment of second error-detecting method must use and be restricted to a part of management frames.One is exemplified as: at the communication equipment that meets second error-detecting method is the connection request initiator, and exists request to set up the management frames of the connection that is used to communicate by letter.The sequence that is being used for connecting; Definite communication counterpart be meet the communication equipment of first error-detecting method after; Owing to being enough to directly confirm the odd even Pa of foundation first error-detecting method, therefore need not to carry out and confirm through odd even generator matrix Gq and transmission data A are multiplied each other that wherein the odd even Qa and this odd even that do not have compatibility can further be converted into the complicated calculations with compatible Pa through adding (Qa+Pa) through simply odd even generator matrix Gp being multiplied each other with transmission data A.

In addition; If frame format can be written in the physical layer header of frame by the type of the management frames of the feasible sequence that is used for connecting of standardization; The communication equipment that then meets first error-detecting method can be replied connection request about connection request and accept frame in the time only can carry out wrong detection or error detection correction about the physical layer header of management frames and can connect.

In other words, when request connects,, then be enough if in the communication equipment that meets second error-detecting method, guarantee the upward compatibility of error-detecting method about the physical layer header of management frames only.With reference to Figure 1B, the data A information word of sign indicating number target (that is, as) is equivalent to physical layer header.Here, be restricted under the situation of association request frame, because the descriptive content (that is, the Bit String of data A) of physical layer header fixes, therefore each is a fixed value from the odd even Pa of odd even generator matrix Gp and Gq generation and Qa respectively.Therefore; The communication equipment that meets second error-detecting method is preserved precalculated addition fixed value (Qa+Pa); And if send with reception period at frame and partly normally to add (that is, getting XOR) addition fixed value (Qa+Pa) about the odd even that generates from the transmission data, then be enough.When the communication equipment that meets second error-detecting method sends association request frame; Use the addition of addition fixed value (Qa+Pa) to handle; Convert the redundant code of the physical layer header that is affixed to this association request frame into odd even Pa based on first error-detecting method, and can guarantee upward compatibility.

On the other hand, even addition fixed value (Qa+Pa) is added to about transmission data A ' rather than the odd even calculated about the physical layer header of association request frame (it is set to Qa ") temporarily, do not convert the redundant code of guaranteeing upward compatibility into yet.If when connecting, introduce the arrangement (like what will describe after a while) of confirming the applied error-detecting method of communication counterpart; After accomplishing connection foundation; If use generates with the corresponding error-detecting method of communication counterpart and checked error-detecting code, then can guarantee upward compatibility with the communication equipment of observing first error-detecting method.

In addition; When the communication equipment that meets second error-detecting method receives the physical layer header of transmission data A ' rather than association request frame; If (Qa+Pa) is added to appended redundant code (promptly with the addition fixed value; Get XOR), then can be to original odd even Qa " carry out reverse transformation, and can use second error-detecting method correctly error detection handle.

In Fig. 2, show the code word that wherein will use second error-detecting method to generate and convert the modified example of guaranteeing with the method for the error-detecting code of the upward compatibility of first error-detecting method into.

In Fig. 2, data K is a fixed value, wherein, the bit position of original transmitted data A from minimum effective bit to higher-order displacement n bit and be represented as X ⁿK.Then, when the fixed value K for the n bit that has been shifted by bit multiply by odd even generator matrix Gq, confirm this fixed value K, make to generate addition fixed value (Qa+Pa).Shown in equality (3), use equality to represent confirming of this fixed value K.

Gq×(X ⁿK) ^T＝(Pa+Qa) ^T (3)

In the case, shown in equality (4), the fixed value K of the displacement of bit position wherein n bit is added to data A (getting XOR), multiply by odd even generator matrix Gq then, can obtain to guarantee redundant code Pa with the upward compatibility of first error-detecting method.

Gq×(A+X ⁿK) ^T＝Pa ^T

Gq×A ^T+Gq×X ⁿK ^T＝Pa ^T (4)

Correspondingly; The communication equipment of second error-detecting method is preserved fixed value K and bit offset is counted n rather than preserved the addition fixed value (Qa+Pa) that will be added to the odd even part if meet; And using the calculating shown in the equality (4) to carry out the conversion of redundant data, then is enough.In addition, when receiving, if the fixed value K that the communication equipment that meets second error-detecting method is shifted the n bit in bit position wherein be added to the data that received after (after getting XOR) error detection or error detection correction, then be enough.

Here, through multiply by the inverse matrix Gq of odd even generator matrix Gq in the both sides of equality (3) ^-1, can confirm fixed value K.Fixed value K is according to the bit position n that is shifted and difference, but under any circumstance, selection fixed value K makes odd even become Qa+Pa.

In Fig. 3, show an example of the frame format of in communication system, using.

Frame among Fig. 3 has following structure, wherein at leading (preamble), physical layer header (PHY head) and about the header check sequence (HCS) of physical layer header afterwards, has physical layer load.

Preorder mainly is used to detection of packets, obtains etc. synchronously in a side of received frame.In physical layer header, write about various types of control informations of physical layer and information is set.In the example shown in the figure; Physical layer header is to have the field of 32 bits altogether, and its field (version) by four bit lengths with the version information that writes communication means, the field (speed) with four bit lengths that write traffic rate, the field (length) that has the reserved field (reservation) of eight bit lengths and have 16 bit lengths that write the information relevant with the length of load form.

In header check sequence (HCS), stored the code word that generates according to first error-detecting method or second error-detecting method.Particularly, for first error-detecting method (ECS), the error-detecting code that storage obtains through the serial data that odd even generator matrix Gp multiply by as the physical layer header with 32 bit lengths of the information word of coded object with 16 bit lengths.In addition; For second error-detecting method (CRC), store code word that obtains through the serial data that odd even generator matrix Gp multiply by physical layer header and the error-detecting code that is affixed to addition fixed value (above-described) with 16 bit lengths with 16 bit lengths with 32 bit lengths.

In the specific management frame such as association request frame, because loaded length constant (perhaps no-load), therefore, the descriptive content of physical layer header (that is Bit String) is steady state value under identical traffic rate.

Adopt second error-detecting method and guarantee with the communication equipment of the upward compatibility of first error-detecting method with corresponding " compliance pattern " transmit frame of first error-detecting method and second error-detecting method time; Multiply by through serial data after odd even generator matrix Gq generates odd even for configures physical layer head; Through this odd even being added to addition fixed value Qa+Pa (through getting XOR), generate header check sequence (with reference to Figure 1B).Perhaps, even can generate header check sequence (with reference to figure 2) through K (wherein the bit position has been shifted the n bit) is added to the serial data of configures physical layer head and multiply by odd even generator matrix Gq.In addition, when with the time, multiply by odd even generator matrix Gp through serial data and generate the header check sequence for configures physical layer head only with first error-detecting method corresponding " lower-order pattern " transmit frame.

Here, the method for the configuration of physical layer load and generated error error detecting code in physical layer load is directly not relevant with design of the present disclosure, and in Fig. 3, has omitted details.

Fig. 4 schematically illustrates and adopts second error-detecting method and guarantee the ios dhcp sample configuration IOS DHCP with the communication equipment of the upward compatibility of first error-detecting method (it is equivalent to the higher-order model).

Communication equipment 40 among Fig. 4 is equipped with Control on Communication part 41, first transmission and Return Reception Dept. to divide 42 and second transmission and Return Reception Dept. to divide 43.

First transmission and Return Reception Dept. divide 42 according to the generation and the verifications of the first error-detecting method error detection sign indicating number, and carry out such as the AD conversion of the modulation of transmission data or demodulation and coding and decoding, transmission and reception signal and DA conversion and the digital processing such as the RF of the down conversion of up conversion that transmits a signal to the RF band or received signal handles.

In addition; Second transmission and Return Reception Dept. divide 43 according to the generation and the verifications of the second error-detecting method error detection sign indicating number, and carry out such as the AD conversion of the modulation of transmission data or demodulation and coding and decoding, transmission and reception signal and DA conversion and the digital processing such as the RF of the down conversion of up conversion that transmits a signal to the RF band or received signal handles.

Here, can use first transmission and Return Reception Dept. to divide 42 and second transmission and Return Reception Dept. to divide 43, a part of circuit of modulation and demodulation circuit, coding and decoding circuit, RF treatment circuit etc. is implemented in together.In addition, first transmission and Return Reception Dept. divide 42 and second transmission and Return Reception Dept. to divide 43 can be equipped with independent transmission and reception antenna, perhaps can have shared antenna.

First transmission that Control on Communication part 41 carries out the control of the processing that transmits and receive data, communication sequence, carry out according to communication sequence and Return Reception Dept. divide 42 and second transmission and Return Reception Dept. to divide 43 control etc.For example, Control on Communication part 41 is controlled and is made use second transmission and Return Reception Dept. divide the specific management frame of 43 transmissions such as association request frame.In addition, Control on Communication part 41 can be after having confirmed the applied error-detecting method of communication counterpart, stops at untapped transmission of the sequence that is used for connecting and Return Reception Dept. and divide in 42 and 43 the operation of any.

Fig. 5 schematically illustrates at first transmission and Return Reception Dept. and divides in 42 the functional configuration according to the sign indicating number generation equipment (ECS) of the first error-detecting method generation error error detecting code.

Odd even generates the part one setter system has odd even generator matrix Gp, and generates the odd even with predetermined codeword length through this Bit String multiply by Gp during the Bit String in being transfused to information word (transmission data).

Bit String when selection part 53 initially is transfused in information word with by the odd even that odd even generation part 51 generates in the output information word, and next when input is accomplished, export odd even.As a result, can obtain following transmission data, wherein odd even is connected to information word by bit.

In addition, Fig. 6 schematically illustrates at first transmission and Return Reception Dept. and divides in 42 the functional configuration according to the sign indicating number generation equipment (ECS) of the first error-detecting method check errors error detecting code.

Select part 61 that the data that received are divided into information word and odd even, and select and output.

Odd even generates part 62 and is equipped with odd even generator matrix Gp, and is generating the odd even with predetermined codeword length through this Bit String multiply by Gp when selecting part 61 to import the Bit String the information word (transmission data).

Generate odd even that part 62 generates and from selecting part 61 to select and during the odd even of output, check part 63 compares two odd evens, and whether matees to come verification in this information word, whether to generate mistake based on odd even being transfused to by odd even.

Then, as the code check equipment among the figure, output information word and check result.

In addition, Fig. 7 schematically illustrates at second transmission and Return Reception Dept. and divides the functional configuration that is used in 43 to generate with the sign indicating number generation equipment (CRC) of the compatible error-detecting code of first error-detecting method.

Odd even generates part 71 and is equipped with odd even generator matrix Gq, and initially generates the odd even with predetermined codeword length through this Bit String multiply by Gq during the Bit String in being transfused to information word (transmission data).

Next, odd even conversion portion 72 is stored addition fixed value Qa+Pa in advance, and addition fixed value Qa+Pa is added to the odd even (getting XOR) that is generated part 71 generations by odd even.

Perhaps; Need not to wait for odd even conversion portion 72; Odd even generates part 71 and is equipped with above-mentioned fixed value K together with odd even generator matrix Gq; And when being transfused to the Bit String of information word (transmission data), the K that bit position wherein is shifted the n bit is added to this Bit String and multiply by odd even generator matrix Gp.

Bit String when selecting part 73 initially to be transfused in the output information word in information word with by the odd even that odd even conversion portion 72 generates, and next when input is accomplished, export odd even.As a result, can obtain following transmission data, wherein odd even is connected to information word by bit.

Here, in the specific management frame such as association request frame, because loaded length constant (perhaps no-load), therefore, the descriptive content of physical layer header (that is Bit String) is steady state value (as stated) under identical traffic rate.The fixed value Qa of addition and Pa are respectively the physical layer header that utilizes association request frame uses corresponding odd even generator matrix Gq and Gp generation as information word odd even.Correspondingly, be under the situation of information word at the physical layer header of association request frame, generate the odd even (getting XOR) that part 71 generates through addition fixed value Qa+Pa being added to by odd even, this odd even is converted into and the identical odd even of sign indicating number generation equipment shown in Figure 5.In other words; Sign indicating number generation equipment shown in Figure 7 can generate about the physical layer header of association request frame with first error-detecting method has compatible header check sequence (that is, even utilize sign indicating number generation equipment shown in Figure 6 also can carry out the header check sequence of correct wrong detection).

In addition, Fig. 8 schematically illustrates to divide at second transmission and Return Reception Dept. and is used for the functional configuration that the sign indicating number generation equipment (CRC) of the error-detecting code that sign indicating number generation equipment shown in Figure 7 generates is used in verification in 43.

Select part 81 that the data that received are divided into information word and odd even, and select and output.

Odd even generates part 82 and is equipped with odd even generator matrix Gq, and is generating the original odd even with predetermined codeword length through this Bit String being multiply by Gq when selecting part 81 to import the Bit String the information word.

On the other hand, odd even reverse transformation part 83 is stored addition fixed value (Qa+Pa) in advance, and addition fixed value Qa+Pa is added to from the odd even (getting XOR) of selecting part 81 to select and export.When the generation error error detecting code, carry out conversion process, wherein, addition fixed value (Qa+Pa) further is added to the odd even that multiplies each other and obtain through with odd even generator matrix Gq and original information word.Correspondingly, in odd even reverse transformation part 83, multiply each other, can reproduce conversion odd even before through odd even and addition fixed value (Qa+Pa) with input, that is, and original odd even.

Perhaps; Odd even reverse transformation part 83 is equipped with fixed value K rather than addition fixed value (Qa+Pa); And through will from select part 81 select and the odd even of output be added to odd even generator matrix Gq and bit position wherein by from minimum effective bit to the multiply each other result of gained of the fixed value K of higher-order displacement n bit; Can reproduce conversion odd even before, that is, and original odd even.

Be transfused to from generating odd even that information word that part 82 imported generates by odd even and during by the odd even after odd even reverse transformation part 83 reverse transformation; Whether check part 84 compares two odd evens, and mate to come verification in this information word, whether to generate mistake based on odd even.

Fig. 9 schematically illustrates the ios dhcp sample configuration IOS DHCP of the communication equipment that adopts first error-detecting method (being equivalent to existing model).

Communication equipment 90 among Fig. 9 is equipped with the Control on Communication part 91 and first transmission and Return Reception Dept. to divide 92.

First transmission and Return Reception Dept. divide 92 according to the generation and the verifications of the first error-detecting method error detection sign indicating number, and carry out such as the AD conversion of the modulation of transmission data or demodulation and coding and decoding, transmission and reception signal and DA conversion and the digital processing such as the RF of the down conversion of up conversion that transmits a signal to the RF band or received signal handles.

In addition, Control on Communication part 91 is carried out the control of the processing that transmits and receive data, communication sequence, first transmission carried out according to communication sequence and Return Reception Dept. divide 92 control etc.

First transmission and Return Reception Dept. divide 92 to be equipped with according to the generation of the first error-detecting method error detection sign indicating number and the functional configuration of verification, and have described said part with reference to figure 5 and 6.

Next, with the communication sequence and the communication sequence between the communication equipment (with reference to figure 9) of communication equipment (with reference to figure 4) that adopts second error-detecting method and employing first error-detecting method that are described between the communication equipment (with reference to figure 4) that adopts second error-detecting method.

In any combination of communication equipment; Carry out following communication sequence; Wherein, Send as the association request frame C-Req (connection request Connection Request) of management frames and another communication equipment through one of communication equipment and to reply and show the intention that receives this connection request, between communication equipment, connect to accept frame C-Acc (Connection-Acceptance is accepted in connection) as the connection request of another management frames.The communication equipment that sends association request frame is equivalent to the for example promoter of active operation, for example is equivalent to the respondent of operation passively and accept the communication equipment that frame replys with connection request.

When the communication equipment (with reference to figure 4) that adopts second error-detecting method receives each management frames C-Re1 and C-Acc; When request uses first error-detecting method to connect, " 0x0 " write in the reserved area of physical layer header, and when request uses second error-detecting method to connect, " 0x1 " write in the reserved area of physical layer header.In addition, under the situation that adopts first error-detecting method and second error-detecting method, the descriptive content of the physical layer header in the C-Req frame is illustrated in the following table.

Table 1

Under the situation that adopts one of first error-detecting method and second error-detecting method, because the descriptive content of physical layer header is identical, the header check sequence of therefore using first error-detecting method or second error-detecting method to generate has equal values.In addition; Using second error-detecting method to generate under the situation of header check sequence; The addition fixed value is appended to the odd even of using odd even generator matrix Gq to generate, and convert value " 0x2003 " and " 0x700b (0xA54E) " compatible into first error-detecting method.

The communication equipment (with reference to figure 4) that adopts second error-detecting method wait for receive corresponding management frames C-Req or C-Acc any the time, Control on Communication part 41 operates first transmission simultaneously and Return Reception Dept. divides 42 and second transmission and Return Reception Dept. to divide 43.Then; Receive corresponding management frames C-Req or C-Acc any the time; With connecting, in communication subsequently, control first transmission and Return Reception Dept. according to the error-detecting method shown in the reserved area that uses in the physical layer header and divide 42 and second transmission and Return Reception Dept. to divide 43 operation.That is to say, in the reserved area of the physical layer header of C-Req that is received or C-Acc frame, write under the situation of " 0x0 " that Control on Communication part 41 is utilized the communication of carrying out subsequently that is provided with of using first error-detecting methods (ECS) to generate the header check sequences.On the other hand, in the reserved area of the physical layer header of C-Req that is received or C-Acc frame, write under the situation of " 0x1 ", Control on Communication part 41 is utilized the communication of carrying out subsequently that is provided with of using second error-detecting methods (CRC) to generate the header check sequences.

In Figure 10, show the processing sequence of when the communication equipment (with reference to figure 4) that adopts second error-detecting method connects with respect to the external communications equipment request, carrying out with the flow chart form.The communication equipment that request connects is equivalent to the for example startup person of active operation, and on the other hand, external communications equipment for example is equivalent to the respondent of operation passively.

Generate connection request, such as utilizing higher-order agreement (such as using) when generating the transmission data (" being " among the step S1001), communication equipment from second transmission and Return Reception Dept. divide 43 send association request frame C-Req in case with data transmission destination connect (step S1002).At this moment, in the reserved area of the physical layer header of C-Req frame, write " 0x1 " thus use the second error-detecting method request to connect, and generate the header check sequence of physical layer header according to second error-detecting method.

Then, after having sent association request frame C-Req, the communication equipment wait receives from the connection request of communication counterpart transmission and accepts frame C-Acc (step S1003).Waiting for reception period, Control on Communication part 41 operates first transmission simultaneously and Return Reception Dept. divides 42 and second transmission and Return Reception Dept. to divide 43.

Here, even wait for to receive still can not receive the C-Acc frame after reaching scheduled time slot the time when not receiving signal (or) (" denying " among the step S1003), this sequence is returned step S1002 and is retransmitted the C-Req frame.Yet, when the repeating transmission number of times reaches predetermined value, can abandon connecting and the end process routine as connection request initiator's communication equipment.

As stated, the header check sequence and first error-detecting method of the C-Req frame of foundation second error-detecting method transmission have compatibility.As a result, in the time can receiving the C-Acc frame (" being " among the step S1003), have following possibility: the transmission initiator is the communication equipment that adopts the communication equipment of first error-detecting method or adopt second error-detecting method.

For example, when receiving any signal, attempt first transmission and Return Reception Dept. and divide the Return Reception Dept. branch in 42 (step S1004).If adopting the communication equipment of first error-detecting method is the transmission initiator of C-Acc frame; Then first transmission and Return Reception Dept. divide 42 to carry out reception, and do not detect mistake (" being " among the step S1004) through using first error-detecting method to carry out verification.In the case; In communication equipment as the connection request initiator; When further affirmation has write " 0x0 " in the reserved area of the physical layer header of the C-Acc that is received; Control on Communication part 41 is utilized the setting of using first error-detecting method (ECS) to generate the header check sequence, uses first transmission and Return Reception Dept. to divide 42 to send ACK frame (step S1005), and uses first error-detecting method to connect.In the reserved area of the physical layer header of ACK frame, write " 0x0 ".Set up connect after, can stop second transmission and Return Reception Dept. and divide 43 operation.

On the other hand; Transmission initiator at the C-Acc frame is not when adopting the communication equipment of first error-detecting method; The C-Acc frame can not be divided 42 to receive by first transmission and Return Reception Dept., perhaps detects mistake (" denying " among the step S1004) through using first error-detecting method to carry out verification.In the case, on the contrary, attempt second transmission and Return Reception Dept. and divide the branch of the Return Reception Dept. in 43.

If second transmission and Return Reception Dept. divide 43 to receive the C-Acc frame and do not detect mistake (" being " among the step S1006) through using second error-detecting method to carry out verification, the transmission initiator that then can confirm the C-Acc frame is the communication equipment that adopts second error-detecting method.In the case; In communication equipment as the connection request initiator; When having write " 0x1 " in the reserved area of the physical layer header of the C-Acc frame of further confirming received; Control on Communication part 41 is utilized the setting of using second error-detecting method (CRC) to generate the header check sequence, uses second transmission and Return Reception Dept. to divide 43 to send ACK frame (step S1007), and uses second error-detecting method to connect.In the reserved area of the physical layer header of ACK frame, write " 0x1 ".Set up connect after, can stop first transmission and Return Reception Dept. and divide 42 operation.

In addition; First transmission that wait for to receive and Return Reception Dept. divide 42 and second transmission and Return Reception Dept. divide 43 both when receiving all that failure perhaps detects mistake in the processing of C-Acc frame (" denying " among the step S1006), processing has been failed and has been finished owing to connection.

In addition, in Figure 11, show the processing sequence of when external communications equipment receives association request frame, carrying out at the communication equipment (with reference to figure 4) that adopts second error-detecting method with the flow chart form.The communication equipment that request connects is equivalent to the for example startup person of active operation, and on the other hand, external communications equipment for example is equivalent to respondent's (identical with aforesaid way) of operation passively.

Communication equipment is waited for and is received the association request frame C-Req (" denying " the step S 1101) that sends from external communications equipment.During the period that wait for to receive, Control on Communication part 41 operates first transmission simultaneously and Return Reception Dept. divides 42 and second transmission and Return Reception Dept. to divide 43, and two transmissions and Return Reception Dept. branch are all waited for reception.

As stated, the header check sequence of the C-Req of foundation second error-detecting method transmission and first error-detecting method are compatible.Therefore, can through first transmission that wait for to receive simultaneously and Return Reception Dept. divide 42 and second transmission and Return Reception Dept. divide 43 both with the C-Req frame error detection of reception.In addition, transmission initiator that might the C-Req frame is neither adopt the communication equipment of first error-detecting method neither adopt the communication equipment of second error-detecting method.

C-Req frame (or any signal) when communication counterpart arrives (" being " the step S1101), initially, attempt using second transmission and Return Reception Dept. to divide 43 to receive and wrong detection processing (step S1102).

If second transmission and Return Reception Dept. divide 43 to receive the C-Req frame and do not detect mistake (" being " among the step S1102) through using second error-detecting method to carry out verification, then confirm the descriptive content (step S1103) of physical layer header as the communication equipment of connection request destination.

Here; In the reserved area of the physical layer header of the C-Req frame that is received, write under the situation of " 0x1 " (" 0x1 " among the step S1103); Control on Communication part 41 is utilized the setting of using second error-detecting method (CRC) to generate the header check sequence, uses second transmission and Return Reception Dept. to divide 43 execution communicate by letter (step S1104) after this.In the case, can stop first transmission and Return Reception Dept. and divide 42 operation.

Next; Generate the C-Acc frame as the communication equipment of connection request destination through in the reserved area of physical layer header, writing " 0x1 " and using second error-detecting method to create the header check sequence, and divide 43 to utilize the C-Acc frame to reply (step S1105) to communication equipment as the connection request initiator from second transmission and Return Reception Dept..Then, after replying,, then use second error-detecting method to connect if in scheduled time slot, can use second transmission and Return Reception Dept. to divide 43 to receive ACK frame (" being " the step S1106) from the connection request initiator with the C-Acc frame.When receiving the ACK frame, confirm in the reserved area of physical layer header, to write " 0x1 ".

In addition, as the communication equipment of connection request destination can not be when the connection request initiator receives the ACK frame (" deny " the step S1106) in the scheduled time slot that sends the C-Acc frame, this sequence is returned step S1105, and repeating transmission C-Acc frame.Yet, when the number of times of retransmitting reaches predetermined value, can abandon connecting and the end process routine as the communication equipment of connection request destination.

On the other hand; When second transmission and Return Reception Dept. divide 43 can not receive the C-Req frame or when using second error-detecting method to carry out verification to detect mistake (" denying " among the step S1102); Perhaps in the reserved area of the physical layer header of the C-Req frame that is received, write under the situation of " 0x0 " (" 0x0 " among the step S1103); Next, attempt to use first transmission and Return Reception Dept. to divide 42 to receive with wrong detection and handle.

When first transmission and Return Reception Dept. divide 42 can not receive the C-Req frame or when using first error-detecting method to carry out verification to detect mistake (" deny " among the step S1107), handle owing to connection has been failed and finished.

In addition; When using first transmission and Return Reception Dept. to divide 42 to receive the C-Req frame and when using first error-detecting method to carry out verification not detect mistake (" being " among the step S1107); Control on Communication part 41 is utilized the setting of using first error-detecting method (ECS) to generate the header check sequence, uses first transmission and Return Reception Dept. to divide 42 execution communicate by letter (step S1108) after this.In the case, can stop second transmission and Return Reception Dept. and divide 43 operation.

Next; Generate the C-Acc frame as the communication equipment of connection request destination through in the reserved area of physical layer header, writing " 0x0 " and using first error-detecting method to create the header check sequence, and divide 42 to utilize C-Acc to reply (step S1109) to communication equipment as the connection request initiator from first transmission and Return Reception Dept..Then, after replying,, then use first error-detecting method to connect if in scheduled time slot, can use first transmission and Return Reception Dept. to divide 42 to receive ACK frame (" being " the step S1110) from the connection request initiator with the C-Acc frame.

In addition, as the communication equipment of connection request destination can not be when the connection request initiator receives the ACK frame (" deny " the step S1110) in the scheduled time slot that sends the C-Acc frame, this sequence is returned step S1109, and repeating transmission C-Acc frame.Yet, when the number of times of retransmitting reaches predetermined value, can abandon connecting and the end process routine as the communication equipment of connection request destination.

Figure 12 illustrate be used for adopt second error-detecting method and guarantee and the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) between the communication sequence example that connects.In Figure 12, be " communication equipment A " as connection request initiator's communication equipment (or masters), be " communication equipment B " as the communication equipment (or passive side) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.

Communication equipment A and communication equipment B operate the CRC of transmitter Tx when waiting for reception, and operate CRC and the ECS of receiver Rx simultaneously.

Communication equipment A sends the C-Req frame through in the reserved area of physical layer header, writing " 0x1 " from the CRC of transmitter Tx, so that use the second error-detecting method request to connect.Use sign indicating number generation equipment shown in Figure 7 to generate the header check sequence of this moment.

At this moment, CRC and the ECS of communication equipment B operation receiver Rx.Use the header check sequence that sign indicating number generation equipment shown in Figure 7 generates can be in the faults in any of the sign indicating number checkout equipment shown in Fig. 6 or 8.That is to say, in communication equipment B side, the C-Req frame error detection that can receive from communication equipment A through CRC or any reception of ECS of use receiver Rx.

Here; At in the CRC of receiver Rx, the decode C-Req frame that received and when confirming to have write " 0x1 " in the reserved area at physical layer header of communication equipment B; Confirm after this to use second transmission and Return Reception Dept. to divide 43 executive communications; And do not use ECS in view of the above, that is to say, stop first transmission and Return Reception Dept. and divide 42 operation.

On the other hand, in communication equipment A side, even owing to waiting for that reception still can not receive the C-Acc frame from communication equipment B after reaching scheduled time slot, therefore retransmits identical C-Req frame as described above.

Communication equipment B only operates the CRC of receiver Rx; And when the CRC that uses receiver Rx receives the C-Req frame of communication equipment A repeating transmission; Utilize the C-Acc frame to reply through in the reserved area of physical layer header, writing " 0x1 " from the CRC of transmitter Tx, thereby use second error-detecting method to accept this connection request.

At this moment, CRC and the ECS of communication equipment A operation receiver Rx.Use the header check sequence that sign indicating number generation equipment shown in Figure 7 generates can be in the faults in any of the sign indicating number checkout equipment shown in Fig. 6 or 8.That is to say that in communication equipment A side, any receives the C-Acc frame that receives from communication equipment B CRC through using receiver Rx or ECS, can error detection.

Here; At in the CRC of receiver Rx, the decode C-Acc frame that received and when confirming to have write " 0x1 " in the reserved area at physical layer header of communication equipment A; Confirm after this to use second transmission and Return Reception Dept. to divide 43 executive communications; And do not use ECS in view of the above, that is to say, stop first transmission and Return Reception Dept. and divide 42 operation.

On the other hand, in communication equipment B side, even owing to waiting for that reception still can not receive the ACK frame from communication equipment A after reaching scheduled time slot, therefore retransmits identical C-Acc frame as described above.

Communication equipment A only operates the CRC of receiver Rx; And when the CRC that uses receiver Rx receives the C-Acc frame of communication equipment B repeating transmission; Send the ACK frame through in the reserved area of physical layer header, writing " 0x1 " from the CRC of transmitter Tx, thereby use second error-detecting method to connect.Then, receiving the ACK frame through communication equipment B connects.

Figure 13 illustrates through adopting second error-detecting method and guaranteeing and is connected the communication sequence example that connects with the communication equipment (with reference to figure 9) of the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) request and employing first error-detecting method (existing model).In Figure 13, be " communication equipment A " as connection request initiator's communication equipment (or active devices), be " communication equipment B " as the communication equipment (or passive equipment) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 or 92 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.

Communication equipment A operates the CRC of transmitter Tx when waiting for reception, and operates CRC and the ECS of receiver Rx simultaneously.On the other hand, communication equipment B only is equipped with the ECS of receiver Rx and transmitter Tx, and operates them.

Use the header check sequence that sign indicating number generation equipment shown in Figure 7 generates can be in faults in any of Fig. 6 or sign indicating number checkout equipment shown in Figure 8.That is to say,, receive the C-Req frame that receives from communication equipment A through the ECS that uses receiver Rx in communication equipment B side, can error detection.

On the other hand, communication equipment B responds the reception from the C-Req frame of communication equipment A, and replys with the C-Acc frame.Because communication equipment B has accepted to use the connection request of first error-detecting method, therefore " 0x0 " is written in the reserved area of physical layer header of C-Acc frame.In addition, use sign indicating number generation equipment shown in Figure 5 to generate the header check sequence of this moment.

At this moment, CRC and the ECS of communication equipment A operation receiver Rx.Use header check sequence that sign indicating number generation equipment shown in Figure 5 generates can be in sign indicating number checkout equipment shown in Figure 6 faults, but can not be in sign indicating number checkout equipment shown in Figure 8 faults.Therefore, in communication equipment A side, can receive the C-Acc frame error detection that receives from communication equipment B through the ECS that only uses receiver Rx.

Here; At in the ECS of receiver Rx, the decode C-Acc frame that received and when confirming to have write " 0x0 " in the reserved area at physical layer header of communication equipment A; Confirm after this to use first transmission and Return Reception Dept. to divide 42 executive communications; And only use ECS in view of the above, that is to say, stop second transmission and Return Reception Dept. and divide 43 operation and activate first transmission and Return Reception Dept. divides 42.

Communication equipment A only operates the ECS of receiver Rx; And when the ECS that uses receiver Rx receives the C-Acc frame of communication equipment B repeating transmission; Send the ACK frame through in the reserved area of physical layer header, writing " 0x0 " from the ECS of transmitter Tx, thereby use first error-detecting method to connect.Then, receiving the ACK frame through communication equipment B connects.

Figure 14 illustrates the communication equipment (with reference to figure 9) that is used for through adopting first error-detecting method (existing model) request and employing second error-detecting method and guarantees and is connected the communication sequence example that connects with the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model).In Figure 14, be " communication equipment A " as connection request initiator's communication equipment (or active devices), be " communication equipment B " as the communication equipment (or passive equipment) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 or 92 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.

Communication equipment A only is equipped with the ECS of receiver Rx and transmitter Tx, and when waiting for reception, operates them.On the other hand, communication equipment B operates the CRC of transmitter Tx when waiting for reception, and operates CRC and the ECS of receiver Rx simultaneously.

Communication equipment A sends the C-Req frame through in the reserved area of physical layer header, writing " 0x0 " from the ECS of transmitter Tx, so that use the first error-detecting method request to connect.Use sign indicating number generation equipment shown in Figure 5 to generate the header check sequence of this moment.

Use header check sequence that sign indicating number generation equipment shown in Figure 5 generates can be in sign indicating number checkout equipment shown in Figure 6 faults, but can not be in sign indicating number checkout equipment shown in Figure 8 faults.Therefore, in communication equipment B side, can receive the C-Req frame error detection that receives from communication equipment A through the ECS that only uses receiver Rx.

Here; At in the ECS of receiver Rx, the decode C-Req frame that received and when confirming to have write " 0x0 " in the reserved area at physical layer header of communication equipment B; Confirm after this to use first transmission and Return Reception Dept. to divide 42 executive communications; And only use ECS in view of the above, that is to say, stop second transmission and Return Reception Dept. and divide 43 operation and activate first transmission and Return Reception Dept. divides 42.

At this moment, communication equipment B only operates the ECS of receiver Rx, and when the C-Req frame that receives from communication equipment A, uses a sign indicating number checkout equipment shown in Figure 6 to come verification header check sequence.Then, if the mistake of not detecting, then communication equipment B utilizes the C-Acc frame to reply from the ECS of transmitter Tx.Owing to use first error-detecting method to accept connection request, therefore in the reserved area of the physical layer header of C-Acc frame, write " 0x0 ".In addition, use sign indicating number generation equipment shown in Figure 5 to generate the header check sequence of this moment.

In addition, even when communication equipment B wait for to receive the ACK frame that still can not receive after reaching scheduled time slot from communication equipment A, as described above from the ECS repeating transmission C-Acc frame of transmitter Tx.

In communication equipment A; When the ECS that uses receiver Rx receives the C-Acc frame of communication equipment B repeating transmission; Send the ACK frame through in the reserved area of physical layer header, writing " 0x0 " from the ECS of transmitter Tx, thereby use first error-detecting method to connect.Then, receiving the ACK frame through communication equipment B connects.

In the embodiment shown in Figure 12 to 14,, can connect through using C-Req and each frame setting of C-Acc and first error-detecting method to have compatible header check sequence in the sequence that is used for connecting.In addition; The expression of the error-detecting method in the reserved area of use physical layer header in C-Req and each frame of C-Acc (promptly; Write " 0x1 ") and with the setting that has with the header check sequence of the compatibility of first error-detecting method, can guarantee upward compatibility with first error-detecting method.

[first modified example of the sequence that is used to connect]

As being used to connect and guaranteeing simultaneously and another method of the upward compatibility of first error-detecting method, there is the method for wherein only using first error-detecting method to carry out the sequence that is used to connect.In the method, in second error-detecting method, odd even that will be through gained that odd even generator matrix Gq and information word as the coding target are multiplied each other is as odd even, and do not carry out Figure 1B and odd even conversion process shown in Figure 2.In addition, in the method, probe request can be sent in the connection request destination after connecting, and it inquires error-detecting method about the connection request initiator, and the connection request initiator replys with ACK this.

In addition; In the method; In each management frames of when connecting, using such as C-Req, C-Acc, ACK etc.; Use version district (version) sign in the physical layer header to be applied to the error-detecting method of this frame, and use reserved area (reservation) to express whether have corresponding relation with second error-detecting method.Particularly, in the reserved area, write " w " with first error-detecting method and the corresponding communication equipment of second error-detecting method, and only corresponding with first error-detecting method communication equipment writes " x " in the reserved area.In addition, when the header check sequence that generates according to first error-detecting method is set, in the version district, write " z ", and when the header check sequence that generates according to second error-detecting method is set, in the version district, write " y ".

Figure 15 illustrates the communication sequence example of wherein using this method.In the communication sequence example in the drawings, adopt second error-detecting method and guarantee and the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) between connect.In Figure 15, be " communication equipment A " as connection request initiator's communication equipment (or active devices), be " communication equipment B " as the communication equipment (or passive equipment) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.

Communication equipment A and communication equipment B operate the ECS of transmitter Tx and the ECS of receiver Rx when waiting for reception.

Communication equipment A sends the C-Req frame from the ECS of transmitter Tx.In the physical layer header of C-Req frame, in the reserved area, write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method.In addition, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " z " of the type that the header check sequence is shown.

When the ECS of receiver Rx received the C-Req frame, communication equipment B utilized the C-Acc frame to reply from the ECS of transmitter Tx.In the physical layer header of C-Acc frame, in the reserved area, write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method.In addition, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " z " of the type that the header check sequence is shown.

In addition, in communication equipment B side, even owing to waiting for that reception still can not receive the ACK frame from communication equipment A after reaching scheduled time slot, therefore the ECS from transmitter Tx retransmits identical C-Acc frame as described above.

Communication equipment A decoding physical layer header and when confirming in the reserved area, to have write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method when the ECS at receiver Rx receives the C-Acc frame; Confirm to use the connection of second error-detecting method; And bring into use the CRC of transmitter Tx and the CRC of receiver Rx (that is, begin second transmission and Return Reception Dept. and divide 43 operation).In addition, communication equipment A utilizes the ACK frame to reply from the ECS of transmitter Tx.In the physical layer header of ACK frame, in the reserved area, write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method.In addition, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " z " of the type that the header check sequence is shown.

In the example in the drawings, communication equipment B fails to receive the ACK frame from communication equipment A, and therefore the ECS from transmitter Tx retransmits identical C-Acc frame as described above.

At this moment; CRC and the ECS of communication equipment A operation receiver Rx; But, therefore in the ECS of receiver Rx, receive successfully, and in the CRC of receiver Rx, take defeat owing to be provided with the header check sequence of using first error-detecting method to generate about the physical layer header of C-Acc frame.Therefore, communication equipment A replys with the ACK frame from the ECS of transmitter Tx in the same manner as described above.

At this moment, communication equipment B can use the ECS of receiver Rx can receive the ACK frame from communication equipment A.Then; When the physical layer header of communication equipment B decoding ACK frame and when confirming in the reserved area, to have write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method; Confirm and to be connected with communication equipment A according to second error-detecting method; And bring into use the CRC of transmitter Tx and the CRC of receiver Rx (that is, begin second transmission and Return Reception Dept. and divide 43 operation).In addition, communication equipment B does not use the ECS of transmitter Tx and the ECS of receiver Rx, promptly stops first transmission and Return Reception Dept. and divides 42 operation.

Communication equipment A is through replying with the ACK frame for the C-Acc frame, and confirms to use second error-detecting method to connect.Yet, suppose following situation: ACK frame no show communication equipment B.Therefore, use probe requests thereby and response sequence here.That is to say that communication equipment B sends probe request C-probe through the CRC from transmitter Tx and begins to connect the affirmation sequence, said probe request C-probe is used for inquiring the error-detecting method that has determined to communication equipment A.In the physical layer header of C-probe frame, in the reserved area, write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method.In addition, the header check sequence of using second error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " of the type that the header check sequence is shown.

At this moment, CRC and the ECS of communication equipment A operation receiver Rx.The header check sequence of C-probe frame is set to use second error-detecting method to generate.Correspondingly, at the physical layer header of communication equipment A decoding C-probe frame, and when confirming in the reserved area, to have write value " z ", the ECS through using receiver Rx but not CRC receives error detection to handle.

Communication equipment A can confirm after this according to the second error-detecting method executive communication based on the C-probe frame that receives from communication equipment A.Then, communication equipment A replys with as probe response with the ACK frame from the CRC of transmitter Tx.In the physical layer header of ACK frame, in the reserved area, write the value " w " that illustrates with the corresponding relation of first error-detecting method and second error-detecting method.In addition, the header check sequence of using second error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " of the type that the header check sequence is shown.In addition, communication equipment A does not use the ECS of transmitter Tx and the ECS of receiver Rx, promptly stops first transmission and Return Reception Dept. and divides 42 operation.

On the other hand, communication equipment B can confirm to connect according to second error-detecting method through receiving the probe response ACK frame from communication equipment A.

In this way; According to communication sequence example shown in Figure 15; In second error-detecting method, do not carry out Figure 1B and odd even conversion process shown in Figure 2, but the communication equipment of using second error-detecting method can connect with the communication equipment of using first error-detecting method.

Here; In communication sequence example shown in Figure 15; Consider to exist following situation: because not connecting about the C-Acc frame from the ACK frame no show communication equipment B of communication equipment A; Communication equipment A uses first error-detecting method to utilize the ACK frame to reply when receiving the C-Acc frame that uses first error-detecting method, and when receiving the C-probe frame that uses second error-detecting method, uses second error-detecting method to utilize the ACK frame to reply.As a result, need confirm wherein to exist the dynamic switching processing of error-detecting method, and circuit becomes complicated as connection request initiator's communication equipment A.

[second modified example of the sequence that is used to connect]

As being used to connect and guaranteeing another method with the upward compatibility of first error-detecting method simultaneously; There is following method; Wherein, In the sequence that connects, send association request frame by use arbitrary error-detecting method as connection request initiator's communication equipment, and when frame re-transmission reaches, switch to another error-detecting method in limited time.With the mode identical with first modified example; In the method; In second error-detecting method, odd even that will be through gained that odd even generator matrix Gq and information word as the coding target are multiplied each other is as odd even, and do not carry out Figure 1B and odd even conversion process shown in Figure 2.

Communication equipment as the connection request initiator passes through the header check sequence that is generated by the arbitrary method in first error-detecting method or second error-detecting method is set, and sends the C-Req frame.Then; Even retransmitted that pre-determined number or time limit have expired and still can not receive the C-Acc frame time at the C-Req frame; Confirm and do not have corresponding relation as the employed error-detecting method of the communication equipment of connection request destination, or do not accept this error-detecting method, and switch to another error-detecting method.

Here, can be provided for retransmitting the maximum times of C-Req frame or the value in time limit as connection request initiator's communication equipment, this value is different for every kind of error-detecting method.Below, when using second error-detecting method, maximum number of retransmissions be N or the time be limited to T1, and when using first error-detecting method, maximum number of retransmissions be M or the time be limited to T2.

In addition; As connection request initiator's communication equipment when the connection request destination receives the C-Acc frame; Through confirming that the error-detecting method of accepting using the connection request destination connects, and after this can continue to use this error-detecting method.

In addition, in each management frames, use the version district (version) in the physical layer header to identify the error-detecting method that is applied to this frame.That is to say, when the header check sequence that generates according to first error-detecting method is set, in the version district, write " y ", and when the header check sequence that generates according to second error-detecting method is set, in the version district, write " x ".

Figure 16 illustrates the communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit.In the communication sequence example in the drawings, adopt second error-detecting method and guarantee and the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) between connect.In Figure 16, be " communication equipment A " as connection request initiator's communication equipment (or masters), be " communication equipment B " as the communication equipment (or passive side) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.In addition, in order to simplify description, suitably omitted the frame re-transmission sequence.

Operate CRC and the ECS of transmitter Tx simultaneously, and operate CRC and the ECS of receiver Rx simultaneously when receiving waiting for as connection request initiator's communication equipment A.Then, communication equipment A sends connection request C-Req frame through alternately switching between the CRC of transmitter Tx and ECS with preset frequency.On the other hand, waiting for when receiving, only operating the CRC of transmitter Tx and operate CRC and the ECS of receiver Rx simultaneously as the communication equipment B of connection request destination.When waiting for reception, receiver RX is received off and on.

Initially, communication equipment A sends the C-Req frame from the CRC of transmitter Tx, so that the connection of second error-detecting method is used in request.In the physical layer header about the C-Req frame, the header check sequence of using second error-detecting method to generate is set, and in the version district of physical layer header, writes the value " x " that the header check sequence that is provided with the generation of foundation second error-detecting method is shown.

At this moment, CRC and the ECS of communication equipment B operation receiver Rx.The header check sequence of C-Req frame is set to use second error-detecting method to generate.Therefore, in communication equipment B, in the CRC of receiver Rx, receive successfully, but in ECS, in the header check sequence, detect mistake and take defeat.Then; The physical layer header of the C-Req frame that receives by the CRC of receiver Rx when decoding and when confirming in the version district, to have write value " x "; Because the communication equipment A that communication equipment B can pick out as the connection request initiator has used second error-detecting method to generate the header check sequence; Therefore do not use the ECS of receiver Rx, promptly stop first transmission and Return Reception Dept. and divide 42 operation.

In addition; In communication equipment A; Can not be when communication equipment B receives the ACK frame in the scheduled time slot after having sent the C-Req frame at CRC from transmitter Tx; Retransmit identical C-Req frame as described above, until maximum number of retransmissions N (perhaps until the time limit that reaches time limit T1) (yet, omitted the n-lustrative of retransmitting sequence and represented) so that simplify the figure among Figure 16.

Next, this moment, communication equipment A sent the C-Req frame from the ECS of transmitter Tx, so that use first error-detecting method to connect.About the physical layer header of C-Req frame, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

In addition; In communication equipment A; Can not be when communication equipment B receives the C-Acc frame in the scheduled time slot after having sent the C-Req frame at ECS from transmitter Tx; Retransmit identical C-Req frame as described above, until maximum number of retransmissions M (perhaps until the time limit that reaches time limit T2) (yet, omitted the n-lustrative of retransmitting sequence and represented) so that simplify the figure among Figure 16.

At this moment, communication equipment B only operates the CRC of receiver Rx.The second header check sequence of C-Req frame is set to use first error-detecting method to generate.As a result, communication equipment B detects mistake when the CRC that uses receiver Rx receives the C-Req frame that generates according to first error-detecting method, and can not carry out decoding.

As a result, because communication equipment B detects mistake when the CRC that only uses receiver Rx receives the C-Req frame, therefore the CRC from transmitter Tx utilizes the C-Acc frame to reply.Physical layer header about the C-Acc frame; Communication equipment B is provided with the header check sequence of using second error-detecting method to generate, and in the version district of physical layer header, writes the value " x " that the header check sequence that is provided with the generation of foundation second error-detecting method is shown.

At this moment, CRC and the ECS of communication equipment A operation receiver Rx.The header check sequence of C-Acc frame is set to use second error-detecting method to generate.Correspondingly, in communication equipment A, in the CRC of receiver Rx, receive successfully, but in the header check sequence, detect mistake and in ECS, take defeat.Then; The physical layer header of the C-Acc frame that is received by the CRC of receiver Rx when decoding and when confirming in the version district, to have write value " x ", communication equipment A can pick out communication equipment B as the connection request destination and use second wrong detection to handle to have generated the header check sequence.Therefore, in communication equipment A, do not use the ECS of receiver Rx, promptly stop first transmission and Return Reception Dept. and divide 42 operation.

In addition; In communication equipment B; Can not be when communication equipment A receives the ACK frame in the scheduled time slot after having sent the C-Acc frame at CRC from transmitter Tx; Retransmit identical C-Acc frame as described above, until maximum number of retransmissions N (perhaps until the time limit that reaches time limit T1) (, in N >=2 shown in the example shown in Figure 16) here.

At this moment, communication equipment A only operates transmitter Tx and the receiver Rx CRC in each.The header check sequence of C-Acc frame is set to use second error-detecting method to generate.When communication equipment A uses the CRC of receiver Rx successfully to receive C-Acc frame, decoding physical layer header and confirms in the version district, to have write " x ", utilize the ACK frame to reply from the CRC of transmitter Tx.About the physical layer header of ACK frame, the header check sequence of using second error-detecting method to generate is set, and in the version district of physical layer header, writes the value " x " that the header check sequence that is provided with the generation of foundation second error-detecting method is shown.

Communication equipment B only operates the CRC of receiver Rx.The header check sequence of ACK frame is set to use second error-detecting method to generate.When communication equipment B uses the CRC of receiver Rx successfully to receive ACK frame, decoding physical layer header and confirms in the version district, to have write " x ", can confirm to have set up connection according to second error-detecting method.

Figure 17 illustrates another communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit.In the communication sequence example in the drawings, adopting second error-detecting method and guaranteeing and the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) and adopting between the communication equipment (with reference to figure 9) (existing model) of first error-detecting method connects.In Figure 17, be " communication equipment A " as connection request initiator's communication equipment (or masters), be " communication equipment B " as the communication equipment (or passive side) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, at transmitter and receiver in each; Divide the functional block of 42 or 92 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.In addition, in order to simplify description, suitably omitted the frame re-transmission sequence.

Operate CRC and the ECS of transmitter Tx simultaneously, and operate CRC and the ECS of receiver Rx simultaneously when receiving waiting for as connection request initiator's communication equipment A.Then, communication equipment A sends connection request C-Req frame through alternately switching between the CRC of transmitter Tx and ECS with preset frequency.On the other hand, waiting for when receiving the ECS of operation transmitter Tx and receiver Rx as the communication equipment B of connection request destination.When waiting for reception, receiver RX is received off and on.

Initially, communication equipment A sends the C-Req frame from the CRC of transmitter Tx, so that the connection of second error-detecting method is used in request.About the physical layer header of C-Req frame, the header check sequence of using second error-detecting method to generate is set, and in the version district of physical layer header, writes the value " x " that the header check sequence that is provided with the generation of foundation second error-detecting method is shown.

Communication equipment B only is equipped with the ECS of receiver Rx, and is waiting for the ECS that operates receiver Rx when receiving.Because the header check sequence of C-Req frame is set to use second error-detecting method to generate, so communication equipment B detects mistake when the ECS that uses receiver Rx receives the C-Req frame, and can not decode.In the case, do not utilize the C-Acc frame to reply from communication equipment B.

In addition; In communication equipment A; Can not be when communication equipment B receives the C-Acc frame in the scheduled time slot after having sent the C-Req frame at CRC from transmitter Tx; Retransmit identical C-Req frame as described above, until maximum number of retransmissions N (perhaps until the time limit that reaches time limit T1) (yet, omitted the n-lustrative of retransmitting sequence and represented) so that simplify the figure among Figure 17.

Next, at this moment, communication equipment A sends the C-Req frame from the ECS of transmitter Tx, so that the connection of first error-detecting method is used in request.About the physical layer header of C-Req frame, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

In addition; In communication equipment A; Can not be when communication equipment B receives the C-Acc frame in the scheduled time slot after having sent the C-Req frame at ECS from transmitter Tx; Retransmit identical C-Req frame as described above, until maximum number of retransmissions M (perhaps until the time limit that reaches time limit T2) (yet, omitted the n-lustrative of retransmitting sequence and represented) so that simplify the figure among Figure 17.

When communication equipment B uses the ECS of receiver Rx successfully to receive the 2nd C-Req frame, utilize the C-Acc frame to reply from the ECS of transmitter Tx.About the physical layer header of C-Acc frame, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

At this moment, CRC and the ECS of communication equipment A operation receiver Rx.The header check sequence of C-Acc frame is set to use first error-detecting method to generate.Correspondingly, in communication equipment A, in the ECS of receiver Rx, receive successfully, but in CRC, in the header check sequence, detect mistake and take defeat.Then; The physical layer header of the C-Acc frame that is received by the ECS of receiver Rx when decoding and when confirming in the version district, to have write value " y ", communication equipment A can pick out communication equipment B as the connection request destination and use first wrong detection to handle to have generated the header check sequence.Therefore, in communication equipment A, do not use the CRC of transmitter Tx and receiver Rx, promptly stop second transmission and Return Reception Dept. and divide 43 operation.

In addition, in communication equipment B, can not when receiving the ACK frame, communication equipment A retransmit identical C-Acc frame as described above in the scheduled time slot after having sent the C-Acc frame at ECS from transmitter Tx.

At this moment, communication equipment A only operates the ECS of transmitter Tx and receiver Rx.The header check sequence of C-Acc frame is set to use first error-detecting method to generate.When communication equipment A uses the ECS of receiver Rx successfully to receive C-Acc frame, decoding physical layer header and confirms in the version district, to have write " y ", utilize the ACK frame to reply from the ECS of transmitter Tx.About the physical layer header of ACK frame, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

When communication equipment B uses the ECS of receiver Rx to receive the ACK frame from communication equipment A, can confirm to have set up connection.

Figure 18 illustrates another communication sequence example of the handoff error detection method of wherein when frame re-transmission reaches, prescribing a time limit.In the communication sequence example in the drawings, adopt the communication equipment (with reference to figure 9) of first error-detecting method (existing model) and adopt second error-detecting method and guarantee and the communication equipment (with reference to figure 4) of the upward compatibility of first error-detecting method (new model) between connect.In Figure 18, be " communication equipment A " as connection request initiator's communication equipment (or masters), be " communication equipment B " as the communication equipment (or passive side) of connection request destination.In addition; At communication equipment A and B in each; Through " Tx " expression transmitter, through " Rx " expression receiver, and at transmitter and receiver in each; Divide the functional block of 42 or 92 equivalences through " ECS " expression and first transmission and Return Reception Dept., represent and second transmission and Return Reception Dept. divide 43 equivalent functional blocks through " CRC ".In addition, represent the period that each functional block is wherein being operated through solid line.In addition, in order to simplify description, suitably omitted the frame re-transmission sequence.

Waiting for when receiving the ECS of operation transmitter Tx and receiver Rx as connection request initiator's communication equipment A.On the other hand, operate CRC and the ECS of transmitter Tx simultaneously, and operate CRC and the ECS of receiver Rx simultaneously when receiving waiting for as the communication equipment B of connection request destination.When waiting for reception, receiver Rx is received off and on.

Communication equipment A sends the C-Req frame from the ECS of transmitter Tx, so that the connection of first error-detecting method is used in request.About the physical layer header of C-Req frame, the header check sequence of using first error-detecting method to generate is set, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

At this moment, CRC and the ECS of communication equipment B operation receiver Rx.The header check sequence of C-Req frame is set to use first error-detecting method to generate.Correspondingly, in communication equipment B, in the ECS of receiver Rx, receive successfully, but in CRC, in the header check sequence, detect mistake and take defeat.Then; The physical layer header of the C-Req frame that receives by the ECS of receiver Rx when decoding and when confirming in the version district, to have write value " y "; Because the communication equipment A that communication equipment B can pick out as the connection request initiator has used the processing of first wrong detection to generate the header check sequence; Therefore do not use the CRC of receiver Rx, promptly stop second transmission and Return Reception Dept. and divide 43 operation.

On the other hand; In communication equipment A; Can not be when communication equipment B receives the C-Acc frame in the scheduled time slot after having sent the C-Req frame at ECS from transmitter Tx; Retransmit identical C-Req frame (yet, omitted the n-lustrative of retransmitting sequence and represented) as described above so that simplify the figure among Figure 18.

At this moment, communication equipment B only operates the ECS of receiver Rx, and when receiving the C-Req frame, can detect mistake.Then, communication equipment B utilizes the C-Acc frame to reply from the ECS of transmitter Tx.Physical layer header about the C-Acc frame; Communication equipment B is provided with the header check sequence of using first error-detecting method to generate, and in the version district of physical layer header, writes the value " y " that the header check sequence that is provided with the generation of foundation first error-detecting method is shown.

In addition; In communication equipment B; Can not be when communication equipment A receives the ACK frame in the scheduled time slot after having sent the C-Acc frame at ECS from transmitter Tx; Retransmit identical C-Acc frame as described above, until maximum number of retransmissions M (perhaps until the time limit that reaches time limit T2) (, in M >=2 shown in the example shown in Figure 180) here.

Communication equipment A can detect mistake when the ECS that uses receiver Rx receives the C-Acc frame of retransmitting.Then, communication equipment A utilizes the ACK frame to reply from the ECS of transmitter Tx.

When communication equipment B receives the ACK frame from communication equipment A, can confirm to have set up connection.

In this way; According to Figure 16 to the communication sequence example shown in Figure 18; In second error-detecting method, do not carry out the odd even conversion process shown in Figure 1B and Fig. 2, but the communication equipment of using second error-detecting method can connect with the communication equipment of using first error-detecting method.

Here, in the communication sequence example shown in Figure 16 to 18, send the C-Req frame through between the CRC of transmitter Tx and ECS, alternately switching with preset frequency as connection request initiator's communication equipment A.On the other hand, the communication equipment B as the connection request destination waits for reception C-Req frame (with reference to Figure 19) when receiver RX is received off and on.If communication equipment B is the respondent of passive operation, from the visual angle of low-power consumption, expectation receives off and on.The duty ratio that intermittently receives changes for each equipment.Under suchlike situation, communication equipment A need consider the longest inoperative period in communication equipment B side receiver Rx dormancy, and the switching frequency that sends the C-Req frame from CRC and ECS is set.As a result, might have following situation: communication equipment B needs the time to receive C-Req frame from communication equipment A so that can connect, and perhaps can not connect.

The disclosure comprise with on the December 6th, 2010 of relevant theme of disclosed theme in the japanese priority patent application JP 2010-272028 that Japan Patent office submits to, by reference its full content is incorporated into this.

It will be understood by those skilled in the art that and depend on design demand and other factors, various modifications, combination, son combination and variation possibly occur, as long as they are in the scope of accompanying claims or its equivalent.

Claims

1. a sign indicating number generates equipment, comprising:

Code word generates part, and it generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for the information word A ' that has imported; And

The code word conversion portion; It generates the code word that part generates based on changing said code word from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

2. sign indicating number generation equipment as claimed in claim 1,

Wherein, Said code word conversion portion is according to the conversion method that code word Qa is converted into code word Pa; Change the code word that generates from the information word A ' that is imported by said code word generation part based on addition fixed value (Qa+Pa); Wherein, code word Qa obtains through the information word A that forms from the particular data string is used the second matrix Gq, and code word Pa obtains through information word A being used the first matrix Gp.

3. sign indicating number generation equipment as claimed in claim 1,

Wherein, said code word conversion portion is changed through the code word additional phase that is generated from the information word A ' that has imported by said code word generation part is added fixed value (Qa+Pa).

4. a sign indicating number generates equipment, comprising:

Fixed value is preserved part; It preserves fixed value K; When after higher-order displacement n bit, using the second matrix Gq from minimum effective bit in the bit position; Can obtain the addition fixed value (Qa+Pa) that forms from corresponding code word Qa and Pa according to this fixed value K, wherein, said code word Qa and Pa are through respectively the first matrix Gp of the second matrix Gq and first error-detecting method being applied to obtain from the information word A of particular data string formation;

Fixed value addition part, its fixed value K is added to input information word A ' from the position of minimum effective bit to higher-order displacement n bit; And

Code word generates part, and its information word A ' that has passed through to addition after the fixed value K uses the second matrix Gq, generates the code word with predetermined codeword length.

5. code generating method comprises:

The second matrix Gq through use second error-detecting method for the information word A ' that has imported generates the code word with predetermined codeword length; And

Based on changing the code word that is generated from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

6. code check equipment comprises:

Code word generates part, and the code word and the original information word A ' of the sign indicating number generation equipment generation of claim 1 used in its input, and generates the code word with predetermined codeword length through the second matrix Gq that uses second error-detecting method for original information word A ';

Code word reverse transformation part; It is based on change the code word with original information word A ' input from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation reversely; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; And

Check part, it relatively carries out verification through generating code word that part generates from original information word A ' by code word with the code word of partly being carried out by the code word reverse transformation after the reverse transformation.

7. code check equipment as claimed in claim 6,

Wherein, Said code word reverse transformation part is according to the conversion method that code word Qa is converted into code word Pa; Change code word based on addition fixed value (Qa+Pa) with original information word A ' input reversely; Wherein, code word Qa obtains through the information word A that forms from the particular data string is used the second matrix Gq, and code word Pa obtains through information word A being used the first matrix Gp.

8. code check equipment as claimed in claim 6,

Wherein, said code word reverse transformation is partly changed through the code word additional phase with original information word A ' input is added fixed value (Qa+Pa) reversely.

9. code check equipment comprises:

Fixed value is preserved part; Code word and original information word A ' that its input uses the sign indicating number generation equipment of claim 1 to generate; And preserve fixed value K; When after higher-order displacement n bit, using the second matrix Gq from minimum effective bit in the bit position; Can obtain the addition fixed value (Qa+Pa) that forms from corresponding code word Qa and Pa according to this fixed value K, wherein, said code word Qa and Pa are through respectively the first matrix Gp of the second matrix Gq and first error-detecting method being applied to obtain from the information word A of particular data string formation;

Fixed value addition part, its with fixed value K be added to original information word A ' from the position of minimum effective bit to higher-order displacement n bit;

Code word generates part, and its information word A ' that has passed through addition after the fixed value K uses the second matrix Gq, generates the code word with predetermined codeword length; And

Check part, it relatively carries out verification through generating code word that part generates by code word with the code word of importing with original information word A '.

10. code check method comprises:

Code word and original information word A ' that input uses the code generating method of claim 5 to generate;

The second matrix Gq through use second error-detecting method for original information word A ' generates the code word with predetermined codeword length;

Based on change code word reversely with original information word A ' input from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms; And

Through comparing, carry out verification from code word and the code word after the reverse transformation that original information word A ' generates.

11. a computer program of writing with computer-reader form, it makes computer be used as with the lower part, comprising:

The code word conversion portion; It generates the code word that part generates based on changing by code word from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa are through respectively the first matrix Gp of this second matrix Gq and first error-detecting method being applied to obtain from the information word A that the particular data string forms.

12. a computer program of writing with computer-reader form, it makes computer be used as with the lower part, comprising:

Check part, it relatively carries out verification through generating the code word that code word that part generates from original information word A ' and said code word reverse transformation partly carry out after the reverse transformation by code word.

13. a communication equipment comprises:

First sends and the Return Reception Dept. branch, the verification that it generates odd even and carry out odd even from the transmission data according to first error-detecting method;

Second sends and the Return Reception Dept. branch, and the verification that it generates odd even and carry out odd even from the transmission data according to second error-detecting method in this second error-detecting method, only generates the odd even identical with first error-detecting method for the specific transmission data; And

The Control on Communication part, it sends according to communication sequence control first and Return Reception Dept. divides and second transmission and the Return Reception Dept. branch.

14. communication equipment as claimed in claim 13,

Wherein, first of communication equipment sends and the Return Reception Dept. branch is equipped with: first odd even generates part, and it generates the odd even with predetermined codeword length through using the first matrix Gp for the transmission data; And the first parity check part, it generates odd even through use the first matrix Gp for the data that received, and through odd even that is generated and the parity ratio that is connected to the data that received are come error detection; And

Second transmission and Return Reception Dept. branch are equipped with: second odd even generates part; Its through use for the transmission data the second matrix Gq generate have the odd even of predetermined codeword length after; Use is changed the odd even that is generated from the addition fixed value (Qa+Pa) of corresponding code word Qa and Pa formation; Wherein, said code word Qa and Pa obtain through respectively this second matrix Gq and this first matrix Gp being applied to the specific transmission data; And the second parity check part; It generates odd even through use the second matrix Gq for the data that received; Use said addition fixed value (Qa+Pa) to change the odd even that is connected to the data that received reversely, and through the parity ratio after odd even that is generated and the reverse transformation is come error detection.

15. communication equipment as claimed in claim 13, wherein,

Second odd even generates part through adding fixed value (Qa+Pa) and change to using odd even additional phase that the second matrix Gq generates for the transmission data; And

Second parity check part odd even additional phase through the data that receive to being connected to adds fixed value (Qa+Pa) and changes reversely.

16. communication equipment as claimed in claim 13, wherein,

The specific transmission data comprise in the communication process that is illustrated in the back method information which uses in first error-detecting method and second error-detecting method, and

Control on Communication partly is based on through second transmission and Return Reception Dept. divides the method information that comprises in the specific transmission data that receive, the traffic operation that control first is sent and Return Reception Dept. branch and second sends and Return Reception Dept. divides.

17. communication equipment as claimed in claim 13,

Wherein, use following communication sequence, wherein, send association request frame, connection request destination via the connection request initiator and utilize connection request to accept that frame is replied and the connection request initiator sends and confirms that response frame connects; And

The specific transmission data are equivalent to the physical layer header of association request frame, and in physical layer header, comprise the method information which uses in first error-detecting method and second error-detecting method in the communication process that is illustrated in the back.

18. communication equipment as claimed in claim 17, wherein,

Control on Communication partly make first send divide with Return Reception Dept. and second send with the Return Reception Dept. branch from second send with Return Reception Dept. divide sent association request frame after wait reception connection request accept frame, said association request frame comprises the method information that use second error-detecting method is shown in physical layer header; Send and the Return Reception Dept. branch can receive connection request when accepting frame first; Send the affirmation response frame through confirming in the physical layer header of this frame, to include the method information of using first error-detecting method to be shown and to send to divide, and use first error-detecting method to connect with Return Reception Dept. from first; And send and the Return Reception Dept. branch can receive connection request when accepting frame second; Send the affirmation response frame through confirming in the physical layer header of this frame, to include the method information of using second error-detecting method to be shown and to send to divide, and use second error-detecting method to connect with Return Reception Dept. from second.

19. communication equipment as claimed in claim 17, wherein,

Control on Communication partly makes first to send and to divide with Return Reception Dept. and second transmission and Return Reception Dept. branch are waited for the reception association request frame; Send and Return Reception Dept. branch can receive association request frame the time second; Through confirming in the physical layer header of this frame, to include the method information of using second error-detecting method of illustrating, send and Return Reception Dept. divides and sends connection request and accept frame and use second to send and Return Reception Dept. divides to carry out and confirms response from second, and use second error-detecting method to connect; Send and Return Reception Dept. branch can receive association request frame the time first; Through confirming in the physical layer header of this frame, to include the method information of using first error-detecting method of illustrating, send and Return Reception Dept. divides and sends connection request and accept frame and use first to send and Return Reception Dept. divides to carry out and confirms response from first, and use first error-detecting method to connect.